net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/rculist.h>
  28 #include <net/p8022.h>
  29 #include <net/arp.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/notifier.h>
  32 #include <net/rtnetlink.h>
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include <asm/uaccess.h>
  36
  37 #include <linux/if_vlan.h>
  38 #include "vlan.h"
  39 #include "vlanproc.h"
  40
  41 #define DRV_VERSION "1.8"
  42
  43 /* Global VLAN variables */
  44
  45 int vlan_net_id __read_mostly;
  46
  47 /* Our listing of VLAN group(s) */
  48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  49
  50 const char vlan_fullname[] = "802.1Q VLAN Support";
  51 const char vlan_version[] = DRV_VERSION;
  52 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  53 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  54
  55 static struct packet_type vlan_packet_type __read_mostly = {
  56         .type = cpu_to_be16(ETH_P_8021Q),
  57         .func = vlan_skb_recv, /* VLAN receive method */
  58 };
  59
  60 /* End of global variables definitions. */
  61
  62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  63 {
  64         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  65 }
  66
  67 /* Must be invoked with RCU read lock (no preempt) */
  68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  69 {
  70         struct vlan_group *grp;
  71         struct hlist_node *n;
  72         int hash = vlan_grp_hashfn(real_dev->ifindex);
  73
  74         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  75                 if (grp->real_dev == real_dev)
  76                         return grp;
  77         }
  78
  79         return NULL;
  80 }
  81
  82 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  83  *
  84  * Must be invoked with RCU read lock (no preempt)
  85  */
  86 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
  87 {
  88         struct vlan_group *grp = __vlan_find_group(real_dev);
  89
  90         if (grp)
  91                 return vlan_group_get_device(grp, vlan_id);
  92
  93         return NULL;
  94 }
  95
  96 static void vlan_group_free(struct vlan_group *grp)
  97 {
  98         int i;
  99
 100         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 101                 kfree(grp->vlan_devices_arrays[i]);
 102         kfree(grp);
 103 }
 104
 105 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 106 {
 107         struct vlan_group *grp;
 108
 109         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 110         if (!grp)
 111                 return NULL;
 112
 113         grp->real_dev = real_dev;
 114         hlist_add_head_rcu(&grp->hlist,
 115                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 116         return grp;
 117 }
 118
 119 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 120 {
 121         struct net_device **array;
 122         unsigned int size;
 123
 124         ASSERT_RTNL();
 125
 126         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 127         if (array != NULL)
 128                 return 0;
 129
 130         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 131         array = kzalloc(size, GFP_KERNEL);
 132         if (array == NULL)
 133                 return -ENOBUFS;
 134
 135         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 136         return 0;
 137 }
 138
 139 static void vlan_rcu_free(struct rcu_head *rcu)
 140 {
 141         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 142 }
 143
 144 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 145 {
 146         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 147         struct net_device *real_dev = vlan->real_dev;
 148         const struct net_device_ops *ops = real_dev->netdev_ops;
 149         struct vlan_group *grp;
 150         u16 vlan_id = vlan->vlan_id;
 151
 152         ASSERT_RTNL();
 153
 154         grp = __vlan_find_group(real_dev);
 155         BUG_ON(!grp);
 156
 157         /* Take it out of our own structures, but be sure to interlock with
 158          * HW accelerating devices or SW vlan input packet processing.
 159          */
 160         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 161                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 162
 163         grp->nr_vlans--;
 164
 165         vlan_group_set_device(grp, vlan_id, NULL);
 166         if (!grp->killall)
 167                 synchronize_net();
 168
 169         unregister_netdevice_queue(dev, head);
 170
 171         /* If the group is now empty, kill off the group. */
 172         if (grp->nr_vlans == 0) {
 173                 vlan_gvrp_uninit_applicant(real_dev);
 174
 175                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 176                         ops->ndo_vlan_rx_register(real_dev, NULL);
 177
 178                 hlist_del_rcu(&grp->hlist);
 179
 180                 /* Free the group, after all cpu's are done. */
 181                 call_rcu(&grp->rcu, vlan_rcu_free);
 182         }
 183
 184         /* Get rid of the vlan's reference to real_dev */
 185         dev_put(real_dev);
 186 }
 187
 188 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 189 {
 190         const char *name = real_dev->name;
 191         const struct net_device_ops *ops = real_dev->netdev_ops;
 192
 193         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 194                 pr_info("8021q: VLANs not supported on %s\n", name);
 195                 return -EOPNOTSUPP;
 196         }
 197
 198         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 199                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 200                 return -EOPNOTSUPP;
 201         }
 202
 203         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 204             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 205                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 206                 return -EOPNOTSUPP;
 207         }
 208
 209         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 210                 return -EEXIST;
 211
 212         return 0;
 213 }
 214
 215 int register_vlan_dev(struct net_device *dev)
 216 {
 217         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 218         struct net_device *real_dev = vlan->real_dev;
 219         const struct net_device_ops *ops = real_dev->netdev_ops;
 220         u16 vlan_id = vlan->vlan_id;
 221         struct vlan_group *grp, *ngrp = NULL;
 222         int err;
 223
 224         grp = __vlan_find_group(real_dev);
 225         if (!grp) {
 226                 ngrp = grp = vlan_group_alloc(real_dev);
 227                 if (!grp)
 228                         return -ENOBUFS;
 229                 err = vlan_gvrp_init_applicant(real_dev);
 230                 if (err < 0)
 231                         goto out_free_group;
 232         }
 233
 234         err = vlan_group_prealloc_vid(grp, vlan_id);
 235         if (err < 0)
 236                 goto out_uninit_applicant;
 237
 238         err = register_netdevice(dev);
 239         if (err < 0)
 240                 goto out_uninit_applicant;
 241
 242         /* Account for reference in struct vlan_dev_info */
 243         dev_hold(real_dev);
 244
 245         netif_stacked_transfer_operstate(real_dev, dev);
 246         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 247
 248         /* So, got the sucker initialized, now lets place
 249          * it into our local structure.
 250          */
 251         vlan_group_set_device(grp, vlan_id, dev);
 252         grp->nr_vlans++;
 253
 254         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 255                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 256         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 257                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 258
 259         return 0;
 260
 261 out_uninit_applicant:
 262         if (ngrp)
 263                 vlan_gvrp_uninit_applicant(real_dev);
 264 out_free_group:
 265         if (ngrp) {
 266                 hlist_del_rcu(&ngrp->hlist);
 267                 /* Free the group, after all cpu's are done. */
 268                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 269         }
 270         return err;
 271 }
 272
 273 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 274  *  Returns 0 if the device was created or a negative error code otherwise.
 275  */
 276 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 277 {
 278         struct net_device *new_dev;
 279         struct net *net = dev_net(real_dev);
 280         struct vlan_net *vn = net_generic(net, vlan_net_id);
 281         char name[IFNAMSIZ];
 282         int err;
 283
 284         if (vlan_id >= VLAN_VID_MASK)
 285                 return -ERANGE;
 286
 287         err = vlan_check_real_dev(real_dev, vlan_id);
 288         if (err < 0)
 289                 return err;
 290
 291         /* Gotta set up the fields for the device. */
 292         switch (vn->name_type) {
 293         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 294                 /* name will look like:  eth1.0005 */
 295                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 296                 break;
 297         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 298                 /* Put our vlan.VID in the name.
 299                  * Name will look like:  vlan5
 300                  */
 301                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 302                 break;
 303         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 304                 /* Put our vlan.VID in the name.
 305                  * Name will look like:  eth0.5
 306                  */
 307                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 308                 break;
 309         case VLAN_NAME_TYPE_PLUS_VID:
 310                 /* Put our vlan.VID in the name.
 311                  * Name will look like:  vlan0005
 312                  */
 313         default:
 314                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 315         }
 316
 317         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 318                                   vlan_setup, real_dev->num_tx_queues);
 319
 320         if (new_dev == NULL)
 321                 return -ENOBUFS;
 322
 323         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 324         dev_net_set(new_dev, net);
 325         /* need 4 bytes for extra VLAN header info,
 326          * hope the underlying device can handle it.
 327          */
 328         new_dev->mtu = real_dev->mtu;
 329
 330         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 331         vlan_dev_info(new_dev)->real_dev = real_dev;
 332         vlan_dev_info(new_dev)->dent = NULL;
 333         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 334
 335         new_dev->rtnl_link_ops = &vlan_link_ops;
 336         err = register_vlan_dev(new_dev);
 337         if (err < 0)
 338                 goto out_free_newdev;
 339
 340         return 0;
 341
 342 out_free_newdev:
 343         free_netdev(new_dev);
 344         return err;
 345 }
 346
 347 static void vlan_sync_address(struct net_device *dev,
 348                               struct net_device *vlandev)
 349 {
 350         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 351
 352         /* May be called without an actual change */
 353         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 354                 return;
 355
 356         /* vlan address was different from the old address and is equal to
 357          * the new address */
 358         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 359             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 360                 dev_uc_del(dev, vlandev->dev_addr);
 361
 362         /* vlan address was equal to the old address and is different from
 363          * the new address */
 364         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 365             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 366                 dev_uc_add(dev, vlandev->dev_addr);
 367
 368         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 369 }
 370
 371 static void vlan_transfer_features(struct net_device *dev,
 372                                    struct net_device *vlandev)
 373 {
 374         unsigned long old_features = vlandev->features;
 375
 376         vlandev->features &= ~dev->vlan_features;
 377         vlandev->features |= dev->features & dev->vlan_features;
 378         vlandev->gso_max_size = dev->gso_max_size;
 379 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 380         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 381 #endif
 382         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
 383         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
 384
 385         if (old_features != vlandev->features)
 386                 netdev_features_change(vlandev);
 387 }
 388
 389 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 390 {
 391         switch (event) {
 392         case NETDEV_CHANGENAME:
 393                 vlan_proc_rem_dev(dev);
 394                 if (vlan_proc_add_dev(dev) < 0)
 395                         pr_warning("8021q: failed to change proc name for %s\n",
 396                                         dev->name);
 397                 break;
 398         case NETDEV_REGISTER:
 399                 if (vlan_proc_add_dev(dev) < 0)
 400                         pr_warning("8021q: failed to add proc entry for %s\n",
 401                                         dev->name);
 402                 break;
 403         case NETDEV_UNREGISTER:
 404                 vlan_proc_rem_dev(dev);
 405                 break;
 406         }
 407 }
 408
 409 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 410                              void *ptr)
 411 {
 412         struct net_device *dev = ptr;
 413         struct vlan_group *grp;
 414         int i, flgs;
 415         struct net_device *vlandev;
 416         struct vlan_dev_info *vlan;
 417         LIST_HEAD(list);
 418
 419         if (is_vlan_dev(dev))
 420                 __vlan_device_event(dev, event);
 421
 422         grp = __vlan_find_group(dev);
 423         if (!grp)
 424                 goto out;
 425
 426         /* It is OK that we do not hold the group lock right now,
 427          * as we run under the RTNL lock.
 428          */
 429
 430         switch (event) {
 431         case NETDEV_CHANGE:
 432                 /* Propagate real device state to vlan devices */
 433                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 434                         vlandev = vlan_group_get_device(grp, i);
 435                         if (!vlandev)
 436                                 continue;
 437
 438                         netif_stacked_transfer_operstate(dev, vlandev);
 439                 }
 440                 break;
 441
 442         case NETDEV_CHANGEADDR:
 443                 /* Adjust unicast filters on underlying device */
 444                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 445                         vlandev = vlan_group_get_device(grp, i);
 446                         if (!vlandev)
 447                                 continue;
 448
 449                         flgs = vlandev->flags;
 450                         if (!(flgs & IFF_UP))
 451                                 continue;
 452
 453                         vlan_sync_address(dev, vlandev);
 454                 }
 455                 break;
 456
 457         case NETDEV_CHANGEMTU:
 458                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 459                         vlandev = vlan_group_get_device(grp, i);
 460                         if (!vlandev)
 461                                 continue;
 462
 463                         if (vlandev->mtu <= dev->mtu)
 464                                 continue;
 465
 466                         dev_set_mtu(vlandev, dev->mtu);
 467                 }
 468                 break;
 469
 470         case NETDEV_FEAT_CHANGE:
 471                 /* Propagate device features to underlying device */
 472                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 473                         vlandev = vlan_group_get_device(grp, i);
 474                         if (!vlandev)
 475                                 continue;
 476
 477                         vlan_transfer_features(dev, vlandev);
 478                 }
 479
 480                 break;
 481
 482         case NETDEV_DOWN:
 483                 /* Put all VLANs for this dev in the down state too.  */
 484                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 485                         vlandev = vlan_group_get_device(grp, i);
 486                         if (!vlandev)
 487                                 continue;
 488
 489                         flgs = vlandev->flags;
 490                         if (!(flgs & IFF_UP))
 491                                 continue;
 492
 493                         vlan = vlan_dev_info(vlandev);
 494                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 495                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 496                         netif_stacked_transfer_operstate(dev, vlandev);
 497                 }
 498                 break;
 499
 500         case NETDEV_UP:
 501                 /* Put all VLANs for this dev in the up state too.  */
 502                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 503                         vlandev = vlan_group_get_device(grp, i);
 504                         if (!vlandev)
 505                                 continue;
 506
 507                         flgs = vlandev->flags;
 508                         if (flgs & IFF_UP)
 509                                 continue;
 510
 511                         vlan = vlan_dev_info(vlandev);
 512                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 513                                 dev_change_flags(vlandev, flgs | IFF_UP);
 514                         netif_stacked_transfer_operstate(dev, vlandev);
 515                 }
 516                 break;
 517
 518         case NETDEV_UNREGISTER:
 519                 /* Delete all VLANs for this dev. */
 520                 grp->killall = 1;
 521
 522                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 523                         vlandev = vlan_group_get_device(grp, i);
 524                         if (!vlandev)
 525                                 continue;
 526
 527                         /* unregistration of last vlan destroys group, abort
 528                          * afterwards */
 529                         if (grp->nr_vlans == 1)
 530                                 i = VLAN_GROUP_ARRAY_LEN;
 531
 532                         unregister_vlan_dev(vlandev, &list);
 533                 }
 534                 unregister_netdevice_many(&list);
 535                 break;
 536
 537         case NETDEV_PRE_TYPE_CHANGE:
 538                 /* Forbid underlaying device to change its type. */
 539                 return NOTIFY_BAD;
 540         }
 541
 542 out:
 543         return NOTIFY_DONE;
 544 }
 545
 546 static struct notifier_block vlan_notifier_block __read_mostly = {
 547         .notifier_call = vlan_device_event,
 548 };
 549
 550 /*
 551  *      VLAN IOCTL handler.
 552  *      o execute requested action or pass command to the device driver
 553  *   arg is really a struct vlan_ioctl_args __user *.
 554  */
 555 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 556 {
 557         int err;
 558         struct vlan_ioctl_args args;
 559         struct net_device *dev = NULL;
 560
 561         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 562                 return -EFAULT;
 563
 564         /* Null terminate this sucker, just in case. */
 565         args.device1[23] = 0;
 566         args.u.device2[23] = 0;
 567
 568         rtnl_lock();
 569
 570         switch (args.cmd) {
 571         case SET_VLAN_INGRESS_PRIORITY_CMD:
 572         case SET_VLAN_EGRESS_PRIORITY_CMD:
 573         case SET_VLAN_FLAG_CMD:
 574         case ADD_VLAN_CMD:
 575         case DEL_VLAN_CMD:
 576         case GET_VLAN_REALDEV_NAME_CMD:
 577         case GET_VLAN_VID_CMD:
 578                 err = -ENODEV;
 579                 dev = __dev_get_by_name(net, args.device1);
 580                 if (!dev)
 581                         goto out;
 582
 583                 err = -EINVAL;
 584                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 585                         goto out;
 586         }
 587
 588         switch (args.cmd) {
 589         case SET_VLAN_INGRESS_PRIORITY_CMD:
 590                 err = -EPERM;
 591                 if (!capable(CAP_NET_ADMIN))
 592                         break;
 593                 vlan_dev_set_ingress_priority(dev,
 594                                               args.u.skb_priority,
 595                                               args.vlan_qos);
 596                 err = 0;
 597                 break;
 598
 599         case SET_VLAN_EGRESS_PRIORITY_CMD:
 600                 err = -EPERM;
 601                 if (!capable(CAP_NET_ADMIN))
 602                         break;
 603                 err = vlan_dev_set_egress_priority(dev,
 604                                                    args.u.skb_priority,
 605                                                    args.vlan_qos);
 606                 break;
 607
 608         case SET_VLAN_FLAG_CMD:
 609                 err = -EPERM;
 610                 if (!capable(CAP_NET_ADMIN))
 611                         break;
 612                 err = vlan_dev_change_flags(dev,
 613                                             args.vlan_qos ? args.u.flag : 0,
 614                                             args.u.flag);
 615                 break;
 616
 617         case SET_VLAN_NAME_TYPE_CMD:
 618                 err = -EPERM;
 619                 if (!capable(CAP_NET_ADMIN))
 620                         break;
 621                 if ((args.u.name_type >= 0) &&
 622                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 623                         struct vlan_net *vn;
 624
 625                         vn = net_generic(net, vlan_net_id);
 626                         vn->name_type = args.u.name_type;
 627                         err = 0;
 628                 } else {
 629                         err = -EINVAL;
 630                 }
 631                 break;
 632
 633         case ADD_VLAN_CMD:
 634                 err = -EPERM;
 635                 if (!capable(CAP_NET_ADMIN))
 636                         break;
 637                 err = register_vlan_device(dev, args.u.VID);
 638                 break;
 639
 640         case DEL_VLAN_CMD:
 641                 err = -EPERM;
 642                 if (!capable(CAP_NET_ADMIN))
 643                         break;
 644                 unregister_vlan_dev(dev, NULL);
 645                 err = 0;
 646                 break;
 647
 648         case GET_VLAN_REALDEV_NAME_CMD:
 649                 err = 0;
 650                 vlan_dev_get_realdev_name(dev, args.u.device2);
 651                 if (copy_to_user(arg, &args,
 652                                  sizeof(struct vlan_ioctl_args)))
 653                         err = -EFAULT;
 654                 break;
 655
 656         case GET_VLAN_VID_CMD:
 657                 err = 0;
 658                 args.u.VID = vlan_dev_vlan_id(dev);
 659                 if (copy_to_user(arg, &args,
 660                                  sizeof(struct vlan_ioctl_args)))
 661                       err = -EFAULT;
 662                 break;
 663
 664         default:
 665                 err = -EOPNOTSUPP;
 666                 break;
 667         }
 668 out:
 669         rtnl_unlock();
 670         return err;
 671 }
 672
 673 static int __net_init vlan_init_net(struct net *net)
 674 {
 675         struct vlan_net *vn = net_generic(net, vlan_net_id);
 676         int err;
 677
 678         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 679
 680         err = vlan_proc_init(net);
 681
 682         return err;
 683 }
 684
 685 static void __net_exit vlan_exit_net(struct net *net)
 686 {
 687         vlan_proc_cleanup(net);
 688 }
 689
 690 static struct pernet_operations vlan_net_ops = {
 691         .init = vlan_init_net,
 692         .exit = vlan_exit_net,
 693         .id   = &vlan_net_id,
 694         .size = sizeof(struct vlan_net),
 695 };
 696
 697 static int __init vlan_proto_init(void)
 698 {
 699         int err;
 700
 701         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 702         pr_info("All bugs added by %s\n", vlan_buggyright);
 703
 704         err = register_pernet_subsys(&vlan_net_ops);
 705         if (err < 0)
 706                 goto err0;
 707
 708         err = register_netdevice_notifier(&vlan_notifier_block);
 709         if (err < 0)
 710                 goto err2;
 711
 712         err = vlan_gvrp_init();
 713         if (err < 0)
 714                 goto err3;
 715
 716         err = vlan_netlink_init();
 717         if (err < 0)
 718                 goto err4;
 719
 720         dev_add_pack(&vlan_packet_type);
 721         vlan_ioctl_set(vlan_ioctl_handler);
 722         return 0;
 723
 724 err4:
 725         vlan_gvrp_uninit();
 726 err3:
 727         unregister_netdevice_notifier(&vlan_notifier_block);
 728 err2:
 729         unregister_pernet_subsys(&vlan_net_ops);
 730 err0:
 731         return err;
 732 }
 733
 734 static void __exit vlan_cleanup_module(void)
 735 {
 736         unsigned int i;
 737
 738         vlan_ioctl_set(NULL);
 739         vlan_netlink_fini();
 740
 741         unregister_netdevice_notifier(&vlan_notifier_block);
 742
 743         dev_remove_pack(&vlan_packet_type);
 744
 745         /* This table must be empty if there are no module references left. */
 746         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 747                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 748
 749         unregister_pernet_subsys(&vlan_net_ops);
 750         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 751
 752         vlan_gvrp_uninit();
 753 }
 754
 755 module_init(vlan_proto_init);
 756 module_exit(vlan_cleanup_module);
 757
 758 MODULE_LICENSE("GPL");
 759 MODULE_VERSION(DRV_VERSION);